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PHYS152Fall2013ExamReview1

# PHYS152Fall2013ExamReview1 - PHYS152Fall2013...

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PHYS 152 Fall 2013 Matt Lui and Anjali Shah Supplemental Instruction [email protected] SI Exam Review 1 Key Topics Ch. 21: Electric Field and Electric Charge Electric Charge ­ Positive and negative charges. Charge is conserved. Opposites attract Coulomb’s Law F= The force that q1 exerts on q2 is the same as the force that q2 exerts on q1, except in the opposite direction Electric Field and Forces Electric field is the __________ per _______ E= Superposition affects both force and electric field means that we can find the total force/electric field on a charge/certain point from multiple charges by doing each separately, then taking the sum. Using Coulomb’s Law to calculate electric field Point charges Distribution of charge Electric Field Lines Always start from charge/charge distribution and go away from positive towards negative Ch. 22 Gauss’s Law Equation: Relates the electric flux through an imaginary Gaussian surface to the amount of charge enclosed by that surface Only can be used for highly symmetric situations Point Charges Gaussian surface: A d =

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PHYS 152 Fall 2013 Matt Lui and Anjali Shah Supplemental Instruction [email protected] Infinite Lines of Charge Gaussian surface: A d = Infinite Planes of Charge Gaussian surface: A d = Some steps to get you started: Break up the problem into the areas where charge enclosed differs Find charge enclosed for each of those regions This could involve an integral if the charge density is not a constant (i.e. charge density = ) r α For those situations, use q enclosed = dV ρ For spherical charge distributions: For cylindrical charge distributions: Make sure you set the right limits of integration! Apply Gauss’s law for each of the regions where charge enclosed differs Ch. 23 Electric Potential and Electric Potential Energy The amount of electric potential energy a point charge would have at a given point
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